Registration Dossier
Registration Dossier
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EC number: 231-203-4 | CAS number: 7446-26-6
Endpoint summary
Administrative data
Description of key information
Additional information
Experimental data on the transport of Dizinc pyrophosphate are not available. Data on the transport and fate of zinc has been evaluated in the EU Risk Assessment Report for zinc metal (ECB, 2008) and by the WHO (WHO, 2001). Some key aspects are summarised below.
Zinc occurs in suspended and dissolved forms in natural waters. Precipitation of soluble zinc compounds appears to be significant only under reducing conditions in waters with high zinc concentrations, particularly when the pH is higher than 8 (Cleven et al., 1993), a rapid environmental transformation of zinc species released from the source and target substance is not likely under the standard environmental conditions. The mobility of zinc depends on the specification of zinc which in turn depends on factors like pH, organic matter content and redox potential. Zinc in freshwater can be divided in several classes, as for instance hydrated zinc ions, zinc ions complexed by organic ligands (humid and fulvic acids), zinc oxy ions and zinc adsorbed to solid matter. The distribution over free zinc and zinc complexes has been found to be roughly 30% and 70%, respectively, in European surface waters (Cleven et al., 1993; Jansen et al., 1998; cited in ECB, 2008). Adsorption to suspended matter and precipitation of zinc complexes with low solubility decreases the mobility of zinc.
The mobility of phosphate depends on the number of phosphate units. The adsorption potential of polyphosphates increases with increasing length (Busman 1984). Precipitation-dissolution and sorption-desorption processes control the concentration pf phosphate ions in solution. Phosphorus ions are mainly immobilised in soils by adsorption to solid matter or by reaction with aluminium or iron to aluminium- and iron phosphates (Cornforth 2008).
Reference
Busman, Lowell Marion, (1984)."Behaviour of polyphosphates in soils “Retrospective Theses and Dissertations. Paper 8979.
Cleven, R.M.F.J., Janus, J.A., Annema, J.A and Slooff, W. (Eds.). 1993. Integrated Criteria Document Zinc. RIVM report 710401028, National Institute of Public Health and the Environment, Bilthoven, The Netherlands. (Originally published in 1992, as RIVM-Report 710401019: “Basisdocument Zink”, In Dutch).
Cornforth I.S. (2008) The fate of phosphate fertilizers in soil. New Zealand Institute of Chemistry. II-Chemicals and Soils-D-Phosphate-2 (with reference to: Dahal 1977; McLaren and Cameron 1990; Syers and Cornforth 1983)
European Chemicals Bureau (ECB), Risk assessment Zinc metal CAS-No.: 7440-66-6, EINECS-No.: 231-175-3, Final report, May 2008, EUR 24587 EN - 2010
Jansen, R.A.G., H.P. van Leeuwen, R.F.M.J. Cleven and M.A.G.T. van den Hoop. 1998. Speciation and lability of zinc(II) in river waters. Environ. Sci. Technol. 32, 3882-3886.
WHO. 2001. Environmental Health Criteria Series 221: Zinc, International Programme on Chemical Safety, World Health Organization, Geneva
West Origon University. Hydration and Hydrolysis of Metal Cations,https://www.wou.edu/las/physci/ch412/hydrolysis.htm, valid from 10 2015 – 10.2018
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